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  • Electronic Resource  (12)
  • 1985-1989  (8)
  • 1970-1974  (3)
  • 1930-1934  (1)
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  • Electronic Resource  (12)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Darstellung und Strukturuntersuchung von MnSeO4.H2O (1974)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 7 (1974), S. 311-311 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The crystal structure of MnSeO4.H2O has been refined by least-squares methods from X-ray powder diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889874009666
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  • 2
    Electronic Resource
    Electronic Resource
    Refinement of simple crystal structures from synchrotron radiation powder diffraction data (1987)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 20 (1987), S. 394-401 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray powder diffractometry with storage-ring radiation was used to test various aspects of a method for refining simple crystal structures (Si, CeO2 and Co3O4). Excellent powder patterns were obtained with 0.17° resolution parallel slits and 1 Å X-rays. The intensities were determined with a double-Gaussian profile-fitting function and used in the powder least-squares refinement program POWLS. Except for Si, the peaks were broadened because of small particle sizes. The R(Bragg) values were in the range 0.4–1.7%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889887086412
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structures of quartz and magnesium germanate by profile analysis of synchrotron-radiation high-resolution powder data (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 182-191 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: High-resolution synchrotron-radiation powder data for quartz and Mg2GeO4, an olivine homologue, were obtained with a 365 mm long parallel-slit collimator with 0.05° aperture. The crystal structures were refined using a pseudo-Voigt profile fitting function and POWLS. Fourier maps were calculated from the measured structure factors of the germanate. The results for quartz were in good agreement with single-crystal data and R(Bragg) increased from 1.35 to 2.20% as the number of reflections included in the refinement increased from 46 to 119; the e.s.d.'s of the positional parameters were 4 to 8 × 10−4. The germanate gave R(Bragg) 4.85% using 77 Miller planes and the e.s.d.'s were 4 to 42 × 10−4. Special attention was given to the profile fitting function and the non-random particle distributions. The JCPDS Diffraction File Nos. will be reported in a later communication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889887011567
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute configuration of (−)-cis-2-ethylcyclohexanamine hydrochloride 0.39-ethanol solvate, C8H18N+.Cl−.0.39C2H6O (1985)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 468-470 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270185004309
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  • 5
    Electronic Resource
    Electronic Resource
    Ytterbium LIII-edge anomalous scattering measured with synchrotron radiation powder diffraction (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 677-683 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The use of synchrotron powder diffraction patterns to determine anomalous scattering contributions is described. The method is illustrated by the determination of f' of Yb at the Yb LIII absorption edge. Four data sets were collected with four wavelengths, fitted with Gaussian profiles and the integrated intensities used to determine by least-squares methods the crystal-structure parameters and the real part f' of the anomalous dispersion. The derived f' values had a precision of ± 0.2 electron units and averaged 32% higher than the Cromer-Liberman theoretical values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876738709874X
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  • 6
    Electronic Resource
    Electronic Resource
    Profile fitting and the two-stage method in neutron powder diffractometry for structure and texture analysis (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 228-239 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An outline and an application of the two-stage method in neutron powder diffractometry are presented. Stage (1): Individual reflection data like position, half-width and integrated intensity are analysed by profile fitting. The profile analysis is based on an experimentally determined instrument function and can be applied without prior knowledge of a structural model. A mathematical procedure is described which results in a variance–covariance matrix containing standard deviations and correlations of the refined reflection parameters. Stage (2): The individual reflection data derived from the profile fitting procedure can be used for appropriate purposes either in structure determination or in texture and strain or stress analysis. The integrated intensities are used in the non-diagonal weighted least-squares routine POWLS for structure refinement. The weight matrix is given by the inverted variance-covariance matrix of stage (1). This procedure is the basis for reliable and real Bragg R values and for a realistic estimation of standard deviations of structural parameters. In the case of texture analysis the integrated intensities are compiled into pole figures representing the intensity distribution for all sample orientations of individual hkl. Various examples for the wide application of the two-stage method in structure and texture analysis are given: structure refinement of a standard quartz specimen, magnetic ordering in the system TbxY1−xAg, preferred orientation effects in deformed marble and texture investigations of a triclinic plagioclase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889888001013
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  • 7
    Electronic Resource
    Electronic Resource
    Verfahren zur physiologischen Auswertung von Extractum Belladonnae und anderen atropinähnlich wirkenden Mitteln (1930)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 153 (1930), S. 94-108 
    Details
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Am überlebenden Kaninchendarm lassen sich atropinartig wirkende Mittel mit wenig Mühe und praktisch ausreichender Genauigkeit auswerten. Das Organ wird in einer Lösung mit konstanter Pilokarpinkonzentration gehalten. Die untersuchten Mittel werden nur kurze Zeit (je 3 Minuten) zur Einwirkung gebracht, und die Wirkungsstärke wird auf Grund der Senkung der Amplitudenlinie (und Vergleich mit Standardlösungen von bekannten Atropin- bzw. Hyoscyamingehalt) beurteillt. L-Hyoscyamin wirkt am Darm gesunder und gut ernährter Tiere zweimal stärker als Atropin, Homatropin zehnmal schwächer. Die physiologische Auswertung neuerer Belladonnaextrakte ergibt nahezu glieche und nur unwesentlich niedrigere Resultate als die chemische Auswertung. Bei älteren Belladonna- und Hyoscyaminextrakten ist aber die Wirksamkeit nur ein kleiner Bruchteil der dem Gesamtalkaloidgehalt entsprechenden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01862637
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen supply, apical dominance and branch growth inPinus radiata (1971)
    Springer
    Plant and soil 34 (1971), S. 515-517 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Branch development inP. radiata seedlings and young trees is affected by the level of nitrogen supply. A marginal nitrogen deficiency reduces branch and stem diameter growth much more than it does stem height growth. On soils of low N content mature trees have better than normal form. Fertilizing young trees may have undesirable side effects such as promoting branch growth and reducing leader dominance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372806
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  • 9
    Electronic Resource
    Electronic Resource
    Die magnetische Struktur und das magnetische Verhalten von ErFe2: Eine Neutronenbeugungsuntersuchung (1971)
    Springer
    The European physical journal 13 (1971), S. 137-148 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Wir haben aus Neutronenbeugungsmessungen an ErFe2-Pulver im Temperaturbereich 4,2°K bis 700°K die magnetische Struktur bestimmt und die Untergittermagnetisierung der Er- und Fe-Untergitter gemessen. ErFe2 ordnet ferrimagnetisch mit einer antiparallelen Orientierung der Er- und Fe-Ionen. Der Neelpunkt liegt bei 600°K. Die Sättigungsmomente bei 4.2°K wurden zuμ(Fe)=1,97μ B undμ(Er)=8,47μ B bestimmt. Die Kopplung der beiden Untergitter erfolgt durch eine antiparallele Spin-Spin-Wechselwirkung. Die Untergittermagnetisierung für die Erbium-Ionen kann in einen induzierten Anteil bei hohen Temperaturen und eine spontane Magnetisierung bei niederen Temperaturen zerlegt werden.
    Abstract: Résumé La structure magnétique de ErFe2 a été déterminée par des mesures de diffraction de neutrons d’un échantillon pulverisé pour des températures entre 4.2 K et 700 K. ErFe2 est ferrimagnétique en dessous de 600 K, les ions Er et Fe s’orientant antiparallèlement. L’aimantation des sous-réseaux Er et Fe a été determinée. Les moments de saturation à 4.2 K ont été évalués àμ(Fe)=1.97μ B etμ(Er)=8.47μ B. Le couplage entre les sous-réseaux est dû à une interaction spin-spin antiparallèle des ions Er et Fe. L’aimantation du sous-réseau des ions Er peut être divisée en une partie induite à hautes températures et une aimantation spontanée à basses températures.
    Notes: Abstract The magnetic structure of ErFe2 has been determined from neutron diffraction measurements on a powderd sample in the temperature region between 4.2°K and 700°K. ErFe2 exhibits ferrimagnetic ordering below 600°K with the Er- and Fe-ions being antiparallel oriented. The separate sublattice magnetisations of the Er- and Fe-sublattices have been determined. The saturation moments at 4.2°K have been found to beμ(Fe)=1.97μ B andμ(Er)=8.47μ B. The coupling between the two sublattices is by an antiparallel spin-spin interaction of the Er and Fe ions. The temperature dependence of the sublattice magnetization of the Er-ions is explained by a separation into two parts: an induced magnetization at high temperatures and a spontaneous magnetization at lower temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422597
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  • 10
    Electronic Resource
    Electronic Resource
    A new cobalt-nickel oxide spinel prepared under high pressure in an oxygen atmosphere (1987)
    Springer
    Journal of materials science 6 (1987), S. 1153-1155 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729167
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